Compound boring bit



FIG. 1 is a perspective view of a compound boring bit showing my new design;

FIG. 2 is a front elevational view thereof, the rear elevational view being a mirror image;

FIG. 3 is a side elevational view thereof, the opposite side being a mirror image;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a rear plan view thereof. 

The ornamental design for a compound boring bit, as shown and described. 